Make an expansion board with a serial port(s) for WL-500b/g

[sguarino]

I have a uart/driver with a 1.8432MHZ xtal.
I can see the linux boot process, but I can't get the PMON boot. Neither if I press reset during power up, in this case I didn't get a byte.

The PC terminal I configure it with:
setserial /dev/ttyS0 divisor 7
setserial /dev/ttyS0 spd_cust
stty speed 38400 < /dev/ttyS0

To get the custom 16457 baud rate.

This is what I get:

CPU revision is: 00024000
Loading BCM4710 MMU routines.
Primary instruction cache 8kb, linesize 16 bytes (2 ways)
Primary data cache 4kb, linesiôe 16 bytes (2 ways)
Linux version 2.4.20 (root@localhost.localdomain) (gcc version 3.2.3 with Broadcom m4
Determined physical RAM map:
memory: 01000000 @ 00000000 (usable)
On node 0 totalpages: 4096
...

Any ideas?

[todd_terry]

Hi everybody!

I've made this expansion board for my WAP54G v1.1 and it works too. I use a "home made" HF generator in order to have the required frequency for the UM82450 since I can't find a 12.750MHz Xtal.

The only problem is that I can't see anything else than that:

CPU revision is: 00024000
Loading BCM4710 MMU routines.
Primary instruction cache 8kb, linesize 16 bytes (2 ways)
Primary data cache 4kb, linesize 16 bytes (2 ways)
Linux version 2.4.20 (root@pcnote) (gcc version 3.3.3) #1 Wed Sep 14 05:26:07 CEST 2005
Determined physical RAM map:
 memory: 00800000 @ 00000000 (usable)
On node 0 totalpages: 2048
zone(0): 2048 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/mtdblock2 rootfstype=squashfs init=/etc/preinit noinitrd console=ttyS0,115200
CPU: BCM4710 rev 0 at 125 MHz
Calibrating delay loop... 82.94 BogoMIPS
Memory: 6280k/8192k available (1399k kernel code, 1912k reserved, 100k data, 64k init, 0k highmem)
Dentry cache hash table entries: 1024 (order: 1, 8192 bytes)
Inode cache hash table entries: 512 (order: 0, 4096 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 2048 (order: 1, 8192 bytes)
Checking for 'wait' instruction...  unavailable.
POSIX conformance testing by UNIFIX
PCI: Disabled
PCI: Fixing up bus 0
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
JFFS2 version 2.2. (C) 2001-2003 Red Hat, Inc.
Squashfs 2.1-r2 (released 2004/12/15) (C) 2002-2004 Phillip Lougher
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0xbf800008 (irq = 2) is a 16450
PPP generic driver version 2.4.2
Physically mapped flash: Found 1 x16 devices at 0x0 in 16-bit bank
 Amd/Fujitsu Extended Query Table at 0x0040
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
Flash device: 0x200000 at 0x1fc00000
Physically mapped flash: squashfs filesystem found at block 739
Creating 5 MTD partitions on "Physically mapped flash":
0x00000000-0x00040000 : "pmon"
0x00040000-0x001f0000 : "linux"
0x000b8fa0-0x0015c7a0 : "rootfs"
mtd: partition "rootfs" doesn't start on an erase block boundary -- force read-only
0x001f0000-0x00200000 : "nvram"
0x00160000-0x001f0000 : "OpenWrt"
sflash: chipcommon not found
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 512 bind 1024)
IPv4 over IPv4 tunneling driver
Linux IP multicast router 0.06 plus PIM-SM
ip_conntrack version 2.1 (5953 buckets, 5953 max) - 352 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NET4: Ethernet Bridge 008 for NET4.0
Bridge firewalling registered
802.1Q VLAN Support v1.7 Ben Greear <greearb@candelatech.com>
All bugs added by David S. Miller <davem@redhat.com>
cryptoapi: loaded
VFS: Mounted root (squashfs filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 64k freed

I bricked my AP with a bad firmware and now it reboots itself every minute, and I can't upload anything since I don't know which IP my AP is using (it's not the default IP and I can't reset it by pressing the RESET button).

What can I do to read it's IP from the RS232 terminal?

[futaris]

According to OpenWRT wiki, this works on any device with the 20pin connector

Has anyone tried this on the WL-HDD?

[floe]

Has anyone tried this on the WL-HDD?

Not yet - I would like to, but I've got a question left beforehand: in the
schematic from Technik, why is CS0 on the UART connected to VCC
and CS1 to A3? I somehow expected it to be the other way round..

Floe

[floe]

As a follow-up, I built a circuit based on Technik's schematic, attached it to my WL-HDD and it works

More details can be found here: OpenWRT Forum

Florian